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In an Electric Pump on water, it pumps heavy water instead, which fusion fuel needs.

Factories and upgrades, in the Mekanism guide

Infused Alloy2Sand2Tin Oremore_horizcraftable too1

The marked one can be crafted too. Pick a bigger depth, or open it on its own page.

Tick what you already have.

radio_button_uncheckedMark as already hadSand

radio_button_uncheckedMark as already had×2Glassgrid_viewFurnace, +8 more

radio_button_uncheckedMark as already had×2Infused Alloysync_problemgathered, not crafted

radio_button_uncheckedMark as already hadTin Oremore_horizmore below

radio_button_uncheckedMark as already hadTin Clumpprecision_manufacturingPurifying (Mekanism), +3 more

radio_button_uncheckedMark as already hadDirty Tin Dustprecision_manufacturingCrushing (Mekanism)

radio_button_uncheckedMark as already hadTin Dustprecision_manufacturingEnriching (Mekanism), +4 more

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